Distributor hose routing help

On this page, from '73 MTSC, it just shows the OSAC as an in-line valve. Maybe that's what your car has/had. It would explain no tee and also only one connection on the vac canister. So apparently it's not a leak, just a delay valve, at least in '73.
1973 Imperial and Chrysler Clean Air System Reference Service Repair Book from the Master Technician's Service Conference (Session 302)